[net-next-2.6.git] / arch / x86 / kernel / efi.c

/*
 * Common EFI (Extensible Firmware Interface) support functions
 * Based on Extensible Firmware Interface Specification version 1.0
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999-2002 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2005-2008 Intel Co.
 *	Fenghua Yu <fenghua.yu@intel.com>
 *	Bibo Mao <bibo.mao@intel.com>
 *	Chandramouli Narayanan <mouli@linux.intel.com>
 *	Huang Ying <ying.huang@intel.com>
 *
 * Copied from efi_32.c to eliminate the duplicated code between EFI
 * 32/64 support code. --ying 2007-10-26
 *
 * All EFI Runtime Services are not implemented yet as EFI only
 * supports physical mode addressing on SoftSDV. This is to be fixed
 * in a future version.  --drummond 1999-07-20
 *
 * Implemented EFI runtime services and virtual mode calls.  --davidm
 *
 * Goutham Rao: <goutham.rao@intel.com>
 *	Skip non-WB memory and ignore empty memory ranges.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include <linux/bcd.h>

#include <asm/setup.h>
#include <asm/efi.h>
#include <asm/time.h>

#define EFI_DEBUG	1
#define PFX 		"EFI: "

int efi_enabled;
EXPORT_SYMBOL(efi_enabled);

struct efi efi;
EXPORT_SYMBOL(efi);

struct efi_memory_map memmap;

struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;

static int __init setup_noefi(char *arg)
{
	efi_enabled = 0;
	return 0;
}
early_param("noefi", setup_noefi);

static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
	return efi_call_virt2(get_time, tm, tc);
}

static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
	return efi_call_virt1(set_time, tm);
}

static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
					     efi_bool_t *pending,
					     efi_time_t *tm)
{
	return efi_call_virt3(get_wakeup_time,
			      enabled, pending, tm);
}

static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
	return efi_call_virt2(set_wakeup_time,
			      enabled, tm);
}

static efi_status_t virt_efi_get_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  u32 *attr,
					  unsigned long *data_size,
					  void *data)
{
	return efi_call_virt5(get_variable,
			      name, vendor, attr,
			      data_size, data);
}

static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
					       efi_char16_t *name,
					       efi_guid_t *vendor)
{
	return efi_call_virt3(get_next_variable,
			      name_size, name, vendor);
}

static efi_status_t virt_efi_set_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  unsigned long attr,
					  unsigned long data_size,
					  void *data)
{
	return efi_call_virt5(set_variable,
			      name, vendor, attr,
			      data_size, data);
}

static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
	return efi_call_virt1(get_next_high_mono_count, count);
}

static void virt_efi_reset_system(int reset_type,
				  efi_status_t status,
				  unsigned long data_size,
				  efi_char16_t *data)
{
	efi_call_virt4(reset_system, reset_type, status,
		       data_size, data);
}

static efi_status_t virt_efi_set_virtual_address_map(
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	return efi_call_virt4(set_virtual_address_map,
			      memory_map_size, descriptor_size,
			      descriptor_version, virtual_map);
}

static efi_status_t __init phys_efi_set_virtual_address_map(
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	efi_status_t status;

	efi_call_phys_prelog();
	status = efi_call_phys4(efi_phys.set_virtual_address_map,
				memory_map_size, descriptor_size,
				descriptor_version, virtual_map);
	efi_call_phys_epilog();
	return status;
}

static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
					     efi_time_cap_t *tc)
{
	efi_status_t status;

	efi_call_phys_prelog();
	status = efi_call_phys2(efi_phys.get_time, tm, tc);
	efi_call_phys_epilog();
	return status;
}

int efi_set_rtc_mmss(unsigned long nowtime)
{
	int real_seconds, real_minutes;
	efi_status_t 	status;
	efi_time_t 	eft;
	efi_time_cap_t 	cap;

	status = efi.get_time(&eft, &cap);
	if (status != EFI_SUCCESS) {
		printk(KERN_ERR "Oops: efitime: can't read time!\n");
		return -1;
	}

	real_seconds = nowtime % 60;
	real_minutes = nowtime / 60;
	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
		real_minutes += 30;
	real_minutes %= 60;
	eft.minute = real_minutes;
	eft.second = real_seconds;

	status = efi.set_time(&eft);
	if (status != EFI_SUCCESS) {
		printk(KERN_ERR "Oops: efitime: can't write time!\n");
		return -1;
	}
	return 0;
}

unsigned long efi_get_time(void)
{
	efi_status_t status;
	efi_time_t eft;
	efi_time_cap_t cap;

	status = efi.get_time(&eft, &cap);
	if (status != EFI_SUCCESS)
		printk(KERN_ERR "Oops: efitime: can't read time!\n");

	return mktime(eft.year, eft.month, eft.day, eft.hour,
		      eft.minute, eft.second);
}

#if EFI_DEBUG
static void __init print_efi_memmap(void)
{
	efi_memory_desc_t *md;
	void *p;
	int i;

	for (p = memmap.map, i = 0;
	     p < memmap.map_end;
	     p += memmap.desc_size, i++) {
		md = p;
		printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
			"range=[0x%016llx-0x%016llx) (%lluMB)\n",
			i, md->type, md->attribute, md->phys_addr,
			md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
			(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
	}
}
#endif  /*  EFI_DEBUG  */

void __init efi_init(void)
{
	efi_config_table_t *config_tables;
	efi_runtime_services_t *runtime;
	efi_char16_t *c16;
	char vendor[100] = "unknown";
	int i = 0;
	void *tmp;

#ifdef CONFIG_X86_32
	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
	memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
#else
	efi_phys.systab = (efi_system_table_t *)
		(boot_params.efi_info.efi_systab |
		 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
	memmap.phys_map = (void *)
		(boot_params.efi_info.efi_memmap |
		 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
#endif
	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
		boot_params.efi_info.efi_memdesc_size;
	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;

	efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab,
				       sizeof(efi_system_table_t));
	if (efi.systab == NULL)
		printk(KERN_ERR "Couldn't map the EFI system table!\n");
	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
	efi_early_iounmap(efi.systab, sizeof(efi_system_table_t));
	efi.systab = &efi_systab;

	/*
	 * Verify the EFI Table
	 */
	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		printk(KERN_ERR "EFI system table signature incorrect!\n");
	if ((efi.systab->hdr.revision >> 16) == 0)
		printk(KERN_ERR "Warning: EFI system table version "
		       "%d.%02d, expected 1.00 or greater!\n",
		       efi.systab->hdr.revision >> 16,
		       efi.systab->hdr.revision & 0xffff);

	/*
	 * Show what we know for posterity
	 */
	c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2);
	if (c16) {
		for (i = 0; i < sizeof(vendor) && *c16; ++i)
			vendor[i] = *c16++;
		vendor[i] = '\0';
	} else
		printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
	efi_early_iounmap(tmp, 2);

	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
	       efi.systab->hdr.revision >> 16,
	       efi.systab->hdr.revision & 0xffff, vendor);

	/*
	 * Let's see what config tables the firmware passed to us.
	 */
	config_tables = efi_early_ioremap(
		efi.systab->tables,
		efi.systab->nr_tables * sizeof(efi_config_table_t));
	if (config_tables == NULL)
		printk(KERN_ERR "Could not map EFI Configuration Table!\n");

	printk(KERN_INFO);
	for (i = 0; i < efi.systab->nr_tables; i++) {
		if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
			efi.mps = config_tables[i].table;
			printk(" MPS=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					ACPI_20_TABLE_GUID)) {
			efi.acpi20 = config_tables[i].table;
			printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					ACPI_TABLE_GUID)) {
			efi.acpi = config_tables[i].table;
			printk(" ACPI=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					SMBIOS_TABLE_GUID)) {
			efi.smbios = config_tables[i].table;
			printk(" SMBIOS=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					HCDP_TABLE_GUID)) {
			efi.hcdp = config_tables[i].table;
			printk(" HCDP=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					UGA_IO_PROTOCOL_GUID)) {
			efi.uga = config_tables[i].table;
			printk(" UGA=0x%lx ", config_tables[i].table);
		}
	}
	printk("\n");
	efi_early_iounmap(config_tables,
			  efi.systab->nr_tables * sizeof(efi_config_table_t));

	/*
	 * Check out the runtime services table. We need to map
	 * the runtime services table so that we can grab the physical
	 * address of several of the EFI runtime functions, needed to
	 * set the firmware into virtual mode.
	 */
	runtime = efi_early_ioremap((unsigned long)efi.systab->runtime,
				    sizeof(efi_runtime_services_t));
	if (runtime != NULL) {
		/*
		 * We will only need *early* access to the following
		 * two EFI runtime services before set_virtual_address_map
		 * is invoked.
		 */
		efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
		efi_phys.set_virtual_address_map =
			(efi_set_virtual_address_map_t *)
			runtime->set_virtual_address_map;
		/*
		 * Make efi_get_time can be called before entering
		 * virtual mode.
		 */
		efi.get_time = phys_efi_get_time;
	} else
		printk(KERN_ERR "Could not map the EFI runtime service "
		       "table!\n");
	efi_early_iounmap(runtime, sizeof(efi_runtime_services_t));

	/* Map the EFI memory map */
	memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map,
				       memmap.nr_map * memmap.desc_size);
	if (memmap.map == NULL)
		printk(KERN_ERR "Could not map the EFI memory map!\n");
	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
	if (memmap.desc_size != sizeof(efi_memory_desc_t))
		printk(KERN_WARNING "Kernel-defined memdesc"
		       "doesn't match the one from EFI!\n");

#ifdef CONFIG_X86_64
	/* Setup for EFI runtime service */
	reboot_type = BOOT_EFI;

#endif
#if EFI_DEBUG
	print_efi_memmap();
#endif
}

/*
 * This function will switch the EFI runtime services to virtual mode.
 * Essentially, look through the EFI memmap and map every region that
 * has the runtime attribute bit set in its memory descriptor and update
 * that memory descriptor with the virtual address obtained from ioremap().
 * This enables the runtime services to be called without having to
 * thunk back into physical mode for every invocation.
 */
void __init efi_enter_virtual_mode(void)
{
	efi_memory_desc_t *md;
	efi_status_t status;
	unsigned long end;
	void *p;

	efi.systab = NULL;
	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if (!(md->attribute & EFI_MEMORY_RUNTIME))
			continue;
		if ((md->attribute & EFI_MEMORY_WB) &&
		    (((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
		      PAGE_SHIFT) < end_pfn_map))
			md->virt_addr = (unsigned long)__va(md->phys_addr);
		else
			md->virt_addr = (unsigned long)
				efi_ioremap(md->phys_addr,
					    md->num_pages << EFI_PAGE_SHIFT);
		if (!md->virt_addr)
			printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
			       (unsigned long long)md->phys_addr);
		end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
		if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
		    ((unsigned long)efi_phys.systab < end))
			efi.systab = (efi_system_table_t *)(unsigned long)
				(md->virt_addr - md->phys_addr +
				 (unsigned long)efi_phys.systab);
	}

	BUG_ON(!efi.systab);

	status = phys_efi_set_virtual_address_map(
		memmap.desc_size * memmap.nr_map,
		memmap.desc_size,
		memmap.desc_version,
		memmap.phys_map);

	if (status != EFI_SUCCESS) {
		printk(KERN_ALERT "Unable to switch EFI into virtual mode "
		       "(status=%lx)!\n", status);
		panic("EFI call to SetVirtualAddressMap() failed!");
	}

	/*
	 * Now that EFI is in virtual mode, update the function
	 * pointers in the runtime service table to the new virtual addresses.
	 *
	 * Call EFI services through wrapper functions.
	 */
	efi.get_time = virt_efi_get_time;
	efi.set_time = virt_efi_set_time;
	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	efi.get_variable = virt_efi_get_variable;
	efi.get_next_variable = virt_efi_get_next_variable;
	efi.set_variable = virt_efi_set_variable;
	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	efi.reset_system = virt_efi_reset_system;
	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
#ifdef CONFIG_X86_64
	runtime_code_page_mkexec();
#endif
}

/*
 * Convenience functions to obtain memory types and attributes
 */
u32 efi_mem_type(unsigned long phys_addr)
{
	efi_memory_desc_t *md;
	void *p;

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if ((md->phys_addr <= phys_addr) &&
		    (phys_addr < (md->phys_addr +
				  (md->num_pages << EFI_PAGE_SHIFT))))
			return md->type;
	}
	return 0;
}

u64 efi_mem_attributes(unsigned long phys_addr)
{
	efi_memory_desc_t *md;
	void *p;

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if ((md->phys_addr <= phys_addr) &&
		    (phys_addr < (md->phys_addr +
				  (md->num_pages << EFI_PAGE_SHIFT))))
			return md->attribute;
	}
	return 0;
}
Commit	Line	Data
5b83683f HY	1	/*
	2	* Common EFI (Extensible Firmware Interface) support functions
	3	* Based on Extensible Firmware Interface Specification version 1.0
	4	*
	5	* Copyright (C) 1999 VA Linux Systems
	6	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	7	* Copyright (C) 1999-2002 Hewlett-Packard Co.
	8	* David Mosberger-Tang <davidm@hpl.hp.com>
	9	* Stephane Eranian <eranian@hpl.hp.com>
	10	* Copyright (C) 2005-2008 Intel Co.
	11	* Fenghua Yu <fenghua.yu@intel.com>
	12	* Bibo Mao <bibo.mao@intel.com>
	13	* Chandramouli Narayanan <mouli@linux.intel.com>
	14	* Huang Ying <ying.huang@intel.com>
	15	*
	16	* Copied from efi_32.c to eliminate the duplicated code between EFI
	17	* 32/64 support code. --ying 2007-10-26
	18	*
	19	* All EFI Runtime Services are not implemented yet as EFI only
	20	* supports physical mode addressing on SoftSDV. This is to be fixed
	21	* in a future version. --drummond 1999-07-20
	22	*
	23	* Implemented EFI runtime services and virtual mode calls. --davidm
	24	*
	25	* Goutham Rao: <goutham.rao@intel.com>
	26	* Skip non-WB memory and ignore empty memory ranges.
	27	*/
	28
	29	#include <linux/kernel.h>
	30	#include <linux/init.h>
	31	#include <linux/efi.h>
	32	#include <linux/bootmem.h>
	33	#include <linux/spinlock.h>
	34	#include <linux/uaccess.h>
	35	#include <linux/time.h>
	36	#include <linux/io.h>
	37	#include <linux/reboot.h>
	38	#include <linux/bcd.h>
	39
	40	#include <asm/setup.h>
	41	#include <asm/efi.h>
	42	#include <asm/time.h>
	43
	44	#define EFI_DEBUG 1
	45	#define PFX "EFI: "
	46
	47	int efi_enabled;
	48	EXPORT_SYMBOL(efi_enabled);
	49
	50	struct efi efi;
	51	EXPORT_SYMBOL(efi);
	52
	53	struct efi_memory_map memmap;
	54
	55	struct efi efi_phys __initdata;
	56	static efi_system_table_t efi_systab __initdata;
	57
8b2cb7a8 HY	58	static int __init setup_noefi(char *arg)
	59	{
	60	efi_enabled = 0;
	61	return 0;
	62	}
	63	early_param("noefi", setup_noefi);
	64
5b83683f HY	65	static efi_status_t virt_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
	66	{
	67	return efi_call_virt2(get_time, tm, tc);
	68	}
	69
	70	static efi_status_t virt_efi_set_time(efi_time_t *tm)
	71	{
	72	return efi_call_virt1(set_time, tm);
	73	}
	74
	75	static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
	76	efi_bool_t *pending,
	77	efi_time_t *tm)
	78	{
	79	return efi_call_virt3(get_wakeup_time,
	80	enabled, pending, tm);
	81	}
	82
	83	static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
	84	{
	85	return efi_call_virt2(set_wakeup_time,
	86	enabled, tm);
	87	}
	88
	89	static efi_status_t virt_efi_get_variable(efi_char16_t *name,
	90	efi_guid_t *vendor,
	91	u32 *attr,
	92	unsigned long *data_size,
	93	void *data)
	94	{
	95	return efi_call_virt5(get_variable,
	96	name, vendor, attr,
	97	data_size, data);
	98	}
	99
	100	static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
	101	efi_char16_t *name,
	102	efi_guid_t *vendor)
	103	{
	104	return efi_call_virt3(get_next_variable,
	105	name_size, name, vendor);
	106	}
	107
	108	static efi_status_t virt_efi_set_variable(efi_char16_t *name,
	109	efi_guid_t *vendor,
	110	unsigned long attr,
	111	unsigned long data_size,
	112	void *data)
	113	{
	114	return efi_call_virt5(set_variable,
	115	name, vendor, attr,
	116	data_size, data);
	117	}
	118
	119	static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
	120	{
	121	return efi_call_virt1(get_next_high_mono_count, count);
	122	}
	123
	124	static void virt_efi_reset_system(int reset_type,
	125	efi_status_t status,
	126	unsigned long data_size,
	127	efi_char16_t *data)
	128	{
129	efi_call_virt4(reset_system, reset_type, status,
130	data_size, data);
131	}
132
133	static efi_status_t virt_efi_set_virtual_address_map(
134	unsigned long memory_map_size,
135	unsigned long descriptor_size,
136	u32 descriptor_version,
137	efi_memory_desc_t *virtual_map)
138	{
139	return efi_call_virt4(set_virtual_address_map,
140	memory_map_size, descriptor_size,
141	descriptor_version, virtual_map);
142	}
143
144	static efi_status_t __init phys_efi_set_virtual_address_map(
145	unsigned long memory_map_size,
146	unsigned long descriptor_size,
147	u32 descriptor_version,
148	efi_memory_desc_t *virtual_map)
149	{
150	efi_status_t status;
151
152	efi_call_phys_prelog();
153	status = efi_call_phys4(efi_phys.set_virtual_address_map,
154	memory_map_size, descriptor_size,
155	descriptor_version, virtual_map);
156	efi_call_phys_epilog();
157	return status;
158	}
159
160	static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
161	efi_time_cap_t *tc)
162	{
163	efi_status_t status;
164
165	efi_call_phys_prelog();
166	status = efi_call_phys2(efi_phys.get_time, tm, tc);
167	efi_call_phys_epilog();
168	return status;
169	}
170
171	int efi_set_rtc_mmss(unsigned long nowtime)
172	{
173	int real_seconds, real_minutes;
174	efi_status_t status;
175	efi_time_t eft;
176	efi_time_cap_t cap;
177
178	status = efi.get_time(&eft, &cap);
179	if (status != EFI_SUCCESS) {
180	printk(KERN_ERR "Oops: efitime: can't read time!\n");
181	return -1;
182	}
183
184	real_seconds = nowtime % 60;
185	real_minutes = nowtime / 60;
186	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
187	real_minutes += 30;
188	real_minutes %= 60;
189	eft.minute = real_minutes;
190	eft.second = real_seconds;
191
192	status = efi.set_time(&eft);
193	if (status != EFI_SUCCESS) {
194	printk(KERN_ERR "Oops: efitime: can't write time!\n");
195	return -1;
196	}
197	return 0;
198	}
199
200	unsigned long efi_get_time(void)
201	{
202	efi_status_t status;
203	efi_time_t eft;
204	efi_time_cap_t cap;
205
206	status = efi.get_time(&eft, &cap);
207	if (status != EFI_SUCCESS)
208	printk(KERN_ERR "Oops: efitime: can't read time!\n");
209
210	return mktime(eft.year, eft.month, eft.day, eft.hour,
211	eft.minute, eft.second);
212	}
213
214	#if EFI_DEBUG
215	static void __init print_efi_memmap(void)
216	{
217	efi_memory_desc_t *md;
218	void *p;
219	int i;
220
221	for (p = memmap.map, i = 0;
222	p < memmap.map_end;
223	p += memmap.desc_size, i++) {
224	md = p;
225	printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
226	"range=[0x%016llx-0x%016llx) (%lluMB)\n",
227	i, md->type, md->attribute, md->phys_addr,
228	md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
229	(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
230	}
231	}
232	#endif /* EFI_DEBUG */
233
234	void __init efi_init(void)
235	{
236	efi_config_table_t *config_tables;
237	efi_runtime_services_t *runtime;
238	efi_char16_t *c16;
239	char vendor[100] = "unknown";
240	int i = 0;
241	void *tmp;
242
243	#ifdef CONFIG_X86_32
244	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
245	memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
246	#else
247	efi_phys.systab = (efi_system_table_t *)
248	(boot_params.efi_info.efi_systab \|
249	((__u64)boot_params.efi_info.efi_systab_hi<<32));
250	memmap.phys_map = (void *)
251	(boot_params.efi_info.efi_memmap \|
252	((__u64)boot_params.efi_info.efi_memmap_hi<<32));
253	#endif
254	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
255	boot_params.efi_info.efi_memdesc_size;
256	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
257	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
258
259	efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab,
260	sizeof(efi_system_table_t));
261	if (efi.systab == NULL)
262	printk(KERN_ERR "Couldn't map the EFI system table!\n");
263	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
264	efi_early_iounmap(efi.systab, sizeof(efi_system_table_t));
265	efi.systab = &efi_systab;
266
267	/*
268	* Verify the EFI Table
269	*/
270	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
271	printk(KERN_ERR "EFI system table signature incorrect!\n");
272	if ((efi.systab->hdr.revision >> 16) == 0)
273	printk(KERN_ERR "Warning: EFI system table version "
274	"%d.%02d, expected 1.00 or greater!\n",
275	efi.systab->hdr.revision >> 16,
276	efi.systab->hdr.revision & 0xffff);
277
278	/*
279	* Show what we know for posterity
280	*/
281	c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2);
282	if (c16) {
283	for (i = 0; i < sizeof(vendor) && *c16; ++i)
284	vendor[i] = *c16++;
285	vendor[i] = '\0';
286	} else
287	printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
288	efi_early_iounmap(tmp, 2);
289
290	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
291	efi.systab->hdr.revision >> 16,
292	efi.systab->hdr.revision & 0xffff, vendor);
293
294	/*
295	* Let's see what config tables the firmware passed to us.
296	*/
297	config_tables = efi_early_ioremap(
298	efi.systab->tables,
299	efi.systab->nr_tables * sizeof(efi_config_table_t));
300	if (config_tables == NULL)
301	printk(KERN_ERR "Could not map EFI Configuration Table!\n");
302
303	printk(KERN_INFO);
304	for (i = 0; i < efi.systab->nr_tables; i++) {
305	if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
306	efi.mps = config_tables[i].table;
307	printk(" MPS=0x%lx ", config_tables[i].table);
308	} else if (!efi_guidcmp(config_tables[i].guid,
309	ACPI_20_TABLE_GUID)) {
310	efi.acpi20 = config_tables[i].table;
311	printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
312	} else if (!efi_guidcmp(config_tables[i].guid,
313	ACPI_TABLE_GUID)) {
314	efi.acpi = config_tables[i].table;
315	printk(" ACPI=0x%lx ", config_tables[i].table);
316	} else if (!efi_guidcmp(config_tables[i].guid,
317	SMBIOS_TABLE_GUID)) {
318	efi.smbios = config_tables[i].table;
319	printk(" SMBIOS=0x%lx ", config_tables[i].table);
320	} else if (!efi_guidcmp(config_tables[i].guid,
321	HCDP_TABLE_GUID)) {
322	efi.hcdp = config_tables[i].table;
323	printk(" HCDP=0x%lx ", config_tables[i].table);
324	} else if (!efi_guidcmp(config_tables[i].guid,
325	UGA_IO_PROTOCOL_GUID)) {
326	efi.uga = config_tables[i].table;
327	printk(" UGA=0x%lx ", config_tables[i].table);
328	}
329	}
330	printk("\n");
331	efi_early_iounmap(config_tables,
332	efi.systab->nr_tables * sizeof(efi_config_table_t));
333
334	/*
335	* Check out the runtime services table. We need to map
336	* the runtime services table so that we can grab the physical
337	* address of several of the EFI runtime functions, needed to
338	* set the firmware into virtual mode.
339	*/
340	runtime = efi_early_ioremap((unsigned long)efi.systab->runtime,
341	sizeof(efi_runtime_services_t));
342	if (runtime != NULL) {
343	/*
344	* We will only need early access to the following
345	* two EFI runtime services before set_virtual_address_map
346	* is invoked.
347	*/
348	efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
349	efi_phys.set_virtual_address_map =
350	(efi_set_virtual_address_map_t *)
351	runtime->set_virtual_address_map;
352	/*
353	* Make efi_get_time can be called before entering
354	* virtual mode.
355	*/
356	efi.get_time = phys_efi_get_time;
357	} else
358	printk(KERN_ERR "Could not map the EFI runtime service "
359	"table!\n");
360	efi_early_iounmap(runtime, sizeof(efi_runtime_services_t));
361
362	/* Map the EFI memory map */
363	memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map,
364	memmap.nr_map * memmap.desc_size);
365	if (memmap.map == NULL)
366	printk(KERN_ERR "Could not map the EFI memory map!\n");
367	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
368	if (memmap.desc_size != sizeof(efi_memory_desc_t))
369	printk(KERN_WARNING "Kernel-defined memdesc"
370	"doesn't match the one from EFI!\n");
371
372	#ifdef CONFIG_X86_64
373	/* Setup for EFI runtime service */
374	reboot_type = BOOT_EFI;
375
376	#endif
377	#if EFI_DEBUG
378	print_efi_memmap();
379	#endif
380	}
381
382	/*
383	* This function will switch the EFI runtime services to virtual mode.
384	* Essentially, look through the EFI memmap and map every region that
385	* has the runtime attribute bit set in its memory descriptor and update
386	* that memory descriptor with the virtual address obtained from ioremap().
387	* This enables the runtime services to be called without having to
388	* thunk back into physical mode for every invocation.
389	*/
390	void __init efi_enter_virtual_mode(void)
391	{
392	efi_memory_desc_t *md;
393	efi_status_t status;
394	unsigned long end;
395	void *p;
396
397	efi.systab = NULL;
398	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
399	md = p;
400	if (!(md->attribute & EFI_MEMORY_RUNTIME))
401	continue;
402	if ((md->attribute & EFI_MEMORY_WB) &&
403	(((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
404	PAGE_SHIFT) < end_pfn_map))
405	md->virt_addr = (unsigned long)__va(md->phys_addr);
406	else
407	md->virt_addr = (unsigned long)
408	efi_ioremap(md->phys_addr,
409	md->num_pages << EFI_PAGE_SHIFT);
410	if (!md->virt_addr)
411	printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
412	(unsigned long long)md->phys_addr);
413	end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
414	if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
415	((unsigned long)efi_phys.systab < end))
416	efi.systab = (efi_system_table_t *)(unsigned long)
417	(md->virt_addr - md->phys_addr +
418	(unsigned long)efi_phys.systab);
419	}
420
421	BUG_ON(!efi.systab);
422
423	status = phys_efi_set_virtual_address_map(
424	memmap.desc_size * memmap.nr_map,
425	memmap.desc_size,
426	memmap.desc_version,
427	memmap.phys_map);
428
429	if (status != EFI_SUCCESS) {
430	printk(KERN_ALERT "Unable to switch EFI into virtual mode "
431	"(status=%lx)!\n", status);
432	panic("EFI call to SetVirtualAddressMap() failed!");
433	}
434
435	/*
436	* Now that EFI is in virtual mode, update the function
437	* pointers in the runtime service table to the new virtual addresses.
438	*
439	* Call EFI services through wrapper functions.
440	*/
441	efi.get_time = virt_efi_get_time;
442	efi.set_time = virt_efi_set_time;
443	efi.get_wakeup_time = virt_efi_get_wakeup_time;
444	efi.set_wakeup_time = virt_efi_set_wakeup_time;
445	efi.get_variable = virt_efi_get_variable;
446	efi.get_next_variable = virt_efi_get_next_variable;
447	efi.set_variable = virt_efi_set_variable;
448	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
449	efi.reset_system = virt_efi_reset_system;
450	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
451	#ifdef CONFIG_X86_64
452	runtime_code_page_mkexec();
453	#endif
454	}
455
456	/*
457	* Convenience functions to obtain memory types and attributes
458	*/
459	u32 efi_mem_type(unsigned long phys_addr)
460	{
461	efi_memory_desc_t *md;
462	void *p;
463
464	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
465	md = p;
466	if ((md->phys_addr <= phys_addr) &&
467	(phys_addr < (md->phys_addr +
468	(md->num_pages << EFI_PAGE_SHIFT))))
469	return md->type;
470	}
471	return 0;
472	}
473
474	u64 efi_mem_attributes(unsigned long phys_addr)
475	{
476	efi_memory_desc_t *md;
477	void *p;
478
479	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
480	md = p;
481	if ((md->phys_addr <= phys_addr) &&
482	(phys_addr < (md->phys_addr +
483	(md->num_pages << EFI_PAGE_SHIFT))))
484	return md->attribute;
485	}
486	return 0;
487	}